refactor: enforce frontend view model boundaries

src/entities/brokerage-account/model/display.ts

@@ -7,7 +7,8 @@ const VISIBLE_CURRENCY_LIMIT = 2;
 
 type BrokerageAccountCard = {
 	account: BrokerageAccount;
-	positionCounts: null | { bonds: number; stocks: number };
+	positionCounts: null
+		| { bonds: number; stocks: number };
 	source?: NonNullable<
 		ReturnType<typeof useBrokerageAccounts>["meta"]
 	>["dependencies"] extends (infer T)[] | undefined
@@ -38,20 +39,26 @@ function brokerageAccountCards(
 			item =>
 				item.resourceKey === `portfolio/${encodeURIComponent(account.id)}`,
 		);
+
 		const summary = account.portfolioSummary;
 		if (!summary)
 			return {
 				account,
-				positionCounts: /* eslint-disable-line unicorn/no-null -- The existing formatter contract uses null for unavailable data. */ null,
+				positionCounts:
+					// eslint-disable-next-line unicorn/no-null -- The existing formatter contract uses null for unavailable data.
+					null,
 				source,
 				summary: { state: "unavailable" },
 			};
+
 		const positionCounts = {
 			bonds: summary.bondPositionCount,
 			stocks: summary.stockPositionCount,
 		};
+
 		if (summary.totalsByCurrency.length === 0)
 			return { account, positionCounts, source, summary: { state: "empty" } };
+
 		return {
 			account,
 			positionCounts,